The Collaborative International Dictionary of English v.0.48:
Assassinator \As*sas"si*na`tor\, n. An assassin. [1913 Webster]WordNet (r) 3.0 (2006):
assassinator n 1: a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed; "his assassins were hunted down like animals"; "assassinators of kings and emperors" [syn: assassin, assassinator, bravo]